Star Trek does, too (the impulse engines are basically sufficiently advanced deuterium fusion rockets), though I wouldn't be surprised if they did use low-level warp fields to reduce their inertial mass even at sublight speeds given on-screen non-Newtonian behaviour. We also know that Star Trek routinely utilizes shielding technology sufficient to deflect anything from micrometeroids to asteroids even on wee little shuttles while moving at superluminal velocities; basically, anything with a warp drive has to mount a navigational deflector of some scale to prevent it from getting shredded. It wouldn't take much speculation to extrapolate outwards to much more powerful deflector/tractor beam systems utilized as meteor defense networks, given the lack of observed kinetic WMDs in that universe.
Honestly, I suspect another stopping point for KKVs as WMDs in either 'verse is FTL sensor technology. One of the advantages of an RKV is that it travels at a velocity rather close to the speed of information; by the time you see it and process that information, you've been hit. The Killing Star works in large part because humanity never sees its death coming. If you can see outward and process data taken in from a sphere at least ten light-years radius in a matter of seconds with the sensors and computers aboard a single starship, you'll be able to identify incoming projectiles fairly quickly and place countermeasures in effect for once those projectiles actually arrive.